Unusual D-type overdrive problem

[Simoneg]

Just removed the non-functioning ex-Spitfire IV overdrive recently installed in our Toledo (see "D-type overdrive in a Toledo" thread 12 July under Toledo/Dolomite) and found the oil pump operating cam (part 513216) freely rotating on the gearbox mainshaft.  Apparently it had lost its woodruff key (WKN304).  The spring clip (139532) securing the cam in position was still there but a loose fit with quite a big gap in its circumference, which may have allowed the key to escape from its groove.  Needless to say no sign of the key in the bottom of the overdrive housing so maybe it became part of the mess of iron shards found in the filter housing.  On the other hand, it is difficult to see how the key could have escaped from its "half-moon" groove in the mainshaft unless it broke up in situ.  Probably more likely that it was inadvertently omitted during a previous rebuild, but if so then this o/d couldn't have been working without it.  

This "fault" could be the only cause of the previous overdrive malfunction but I've got a recon overdrive ready to fit now anyway.  New woodruff keys seem to be available (not sure about the spring clip) but I'm wondering if the key will hold in place because the cam seems to be a pretty loose fit on the mainshaft.  Anyone know whether this is normal?  Years ago I used Araldite to secure a loose key like this but not inside a gearbox and not sure whether it would survive constant oil exposure.  Any views?

Simon

[Pete Lewis]

the cam is normally a simple push fit and runs up down the shaft easily.
have you fitted the OD with the cam on its high stroke so that the lead in on the pump roller has not been able to climb the cam ram and the force of shoving it on has jumped the circlip out of its groove ??
the cam  lobe has to be low point oposite the pump roller to allow the fitting without damage
Pete